This Problem Set is a part of the Lesson 5, Unit 3, Grade 8. Recognize that the rate of change of the linear relationship is the same value as the slope of the graph of the relationship. Learning targets: students can find the rate of change of a linear relationship by figuring out the slope of the line representing the relationship. If students will use actual cups, gather cups and perform activities ahead of time so that you know measurements for your particular type of cup.